Posture support device



FIG. 1 is a front perspective view of a posture support device in accordance with the present design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The evenly dashed broken lines depict portions of the posture support device and form no part of the claim. The dash dot dash lines depict environment and form no part of the claim. 

CLAIM The ornamental design for a posture support device, as shown and described. 